Rejuvenating compounds in high performance asphalt compositions with high recycled content

Abstract

Described herein is a rejuvenated asphalt and a method of rejuvenating asphalt comprising mixing a rejuvenator, bitumen, and aggregate to obtain an asphalt mixture, wherein the rejuvenator is present in an amount ranging from about 0.1-40 wt % by weight of the bitumen, and wherein at least 35 wt % of the bitumen is derived from recycled asphalt content. The rejuvenated asphalt provides desirable performance.

The invention claimed is: 
     
       1. A method, comprising:
 mixing a rejuvenator, bitumen, and aggregate to obtain an asphalt mixture, wherein the bitumen is 3 wt % to 7 wt % of the asphalt mixture; 
 wherein the rejuvenator is a polymerized oil that is polymerized via sulfurization, and the rejuvenator comprises 0.5-5 wt % by weight of the bitumen, 
 wherein at least 35 wt % of the bitumen is derived from recycled asphalt content, and 
 wherein the asphalt mixture achieves less than 12.5 mm of rutting as determined by Hamburg Wheeltracker test standard in accordance with AASTHO T 324. 
 
     
     
       2. The method of  claim 1 , wherein the polymerized oil is derived from a biorenewable oil source. 
     
     
       3. The method of  claim 1 , wherein the asphalt mixture achieves a mixture Tg of 0° C. or lower. 
     
     
       4. The method of  claim 1 , wherein the recycled asphalt content has been recycled more than once. 
     
     
       5. The method of  claim 1 , wherein 100 wt % of bitumen is derived from recycled asphalt content. 
     
     
       6. The method of  claim 1 , wherein the recycled asphalt content is either recycled asphalt pavement or recycled asphalt shingles or asphalt resulting from a solvent de-asphalting process. 
     
     
       7. The method of  claim 1 , wherein the recycled asphalt content comes from pavement treated with warm mix, antistrip, emulsifier, and/or wax additives. 
     
     
       8. The method of  claim 1 , wherein the asphalt mixture achieves a mixture Tg of −10° C. or lower. 
     
     
       9. The method of  claim 1 , wherein the rejuvenator has a Hildebrandt Solubility parameter ranging from 6 to 12. 
     
     
       10. The method of  claim 1 , further comprising using the asphalt mixture for roofing applications. 
     
     
       11. A rejuvenated asphalt, comprising:
 a rejuvenator, bitumen, and aggregate, wherein the bitumen is 3 wt % to 7 wt % of the rejuvenated asphalt; 
 wherein the rejuvenator is a polymerized oil that is polymerized via sulfurization, and the rejuvenator is present in an amount ranging from about 0.5-5 wt % by weight of the bitumen, 
 wherein at least 35 wt % of the bitumen is derived from recycled asphalt content, and 
 wherein the rejuvenated asphalt achieves less than 12.5 mm of rutting as determined by Hamburg Wheeltracker test standard in accordance with AASTHO T 324. 
 
     
     
       12. The asphalt of  claim 11 , wherein 100 wt % of bitumen is derived from recycled asphalt content. 
     
     
       13. The asphalt of  claim 11 , wherein the rejuvenator has an increase in 60° C. viscosity increase of 300% or less after aging at 100° C. in the Pressure Aging Vassal for 20 hrs at 2.1 MPa air pressure, compared to the unaged rejuvenator. 
     
     
       14. The asphalt of  claim 11 , wherein the rejuvenator replenishes the resin fraction and has an oxidation induction time of 15 minutes or longer at 130° C. 
     
     
       15. The asphalt of  claim 11 , wherein the rejuvenator replenishes the resin fraction and has an increase in 60° C. viscosity increase of 300% or less after aging at 100° C. in the Pressure Aging Vassal for 20 hrs at 2.1 MPa air pressure, compared to the unaged rejuvenator. 
     
     
       16. The asphalt of  claim 11 , wherein the rejuvenator has a Hildebrandt solubility parameter of about 6 to about 12 and has an oxidation induction time of 15 minutes or longer at 130° C. 
     
     
       17. The asphalt of  claim 11 , wherein the rejuvenator has a Hildebrandt solubility parameter of about 6 to about 12 and has an increase in 60° C. viscosity increase of 300% or less after aging at 100° C. in the Pressure Aging Vassal for 20 hrs at 2.1 MPa air pressure, compared to the unaged rejuvenator. 
     
     
       18. The asphalt of  claim 11 , wherein the rejuvenator consists of the polymerized oil and replenishes the resin fraction and has an oxidation induction time of 15 minutes or longer at 130° C. 
     
     
       19. The asphalt of  claim 11 , wherein the rejuvenator consists of the polymerized oil and replenishes the resin fraction and has an increase in 60° C. viscosity increase of 300% or less after aging at 100° C. in the Pressure Aging Vassal for 20 hrs at 2.1 MPa air pressure, compared to the unaged rejuvenator. 
     
     
       20. The asphalt of  claim 11 , wherein the rejuvenator consists of the polymerized oil and has a Hildebrandt solubility parameter of about 6 to about 12 and has an oxidation induction time of 15 minutes or longer at 130° C. 
     
     
       21. The asphalt of  claim 11 , wherein the rejuvenator consists of the polymerized oil and has a Hildebrandt solubility parameter of about 6 to about 12 and has an increase in 60° C. viscosity increase of 300% or less after aging at 100° C. in the Pressure Aging Vassal for 20 hrs at 2.1 MPa air pressure, compared to the unaged rejuvenator.